RAMOTSHERE MOILOA SUBDISTRICT TECHNOLOGY TERM 2 EXAMINATIONS JUNE 2018

RAMOTSHERE MOILOA SUBDISTRICT

TECHNOLOGY TERM 2 EXAMINATIONS

JUNE 2018

GRADE 9

MARKS: 80

DURATION: 2 Hrs. NAME OF LEARNER: ____________________________ CLASS: _______________________________

Time: 2 hours Marks: 80

This question paper consists of 12 pages.

Technology/Grade 9

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RAMOSUDI June 2018

Instructions to learners:

1. Read all the instructions carefully 2. Answer all the questions in a separate answer sheet 3. Write neatly and legibly

Resources needed for drawing

1. Pencil, Colouring pencils 2. Mathematical instruments 3. Eraser/rubber 3. Calculator

Technology/Grade 9

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SECTION A QUESTION 1

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1.1 Four possible answers are given. Circle the letter of the correct one 1.1 In Technology drawing, Scale 1:2 mean that the drawing is drawn at ...

A the actual size of the model

B two times the size of the model

C half the size of the model

D twelve times the size of the model.

(1)

1.2 The design brief clearly indicates ...

A what the designer is going to make to solve the problem.

B what the designer is going to ask about to solve the problem.

C what the designer does not want to do.

D what steps will be followed in problem solving.

(1)

1.3 According to Pascal's principle, the pressure exerted on one part of the hydraulic system is transferred...

A equally to all parts of the system B without any losses C in all directions to other parts of the system. D all of the above.

(1)

1.4 The type of force that is exerted on the bridge by the vehicles passing over the bridge...

A Stable force

B Static force

C Curving force

D Dynamic force

(1)

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1.5 Hydraulic jack uses ............... to operate.

A gears

B fluids

C compressed gas

D fixed pulleys

(1)

[5]

QUESTION 2

State whether the following statements are true or false. Write your answer on the space provided.

3.1 The isometric and oblique drawings show the 3D at differentangle ....... (1)

3.2 A wedge is an example of a strut ............................

(1)

3.3 A cam and a cleat are used as controlling mechanism in pulley

Ropes... ...................

(1)

2.4 Worm and gear changes the axis of rotation in gear systems............. (1)

2.5 A structure which is pulled apart is under compression force.......... (1)

[5]

QUESTION 3

Match the statements in column A with the correct answer in column B and

write the correct answer in column C

Column A

Column C

Column B

3.1 Torsion in structures can also be called 3.2 In a hydraulic system the output

cylinder is also known as

3.3 Systems that uses compressed gases are known as

3.4 The metals deteriorate when they are exposed to moisture.

3.5 When doing a budget for a construction company one of the costs to be considered is.

A. Corrosion B. Pneumatic C. Master cylinder D. Labour E. Twisting

F. Slave

cylinder

G. Static force. H. Dynamic force

[5]

TOTAL SECTION A: [15]

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SECTION B

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QUESTION 4 (STRUCTURES)

Scenario

People from rural areas sometimes risk drowning each time they cross the river to the city. In some areas the rivers have dangerous crocodiles which also attack the people crossing. There are times when the villagers cross in groups and help each other.

4.1 Identify the problem in the scenario above.

______________________________________________________

_____________________________________________________

(2)

4.2 Write a design brief to solve the identified problem.

______________________________________________________

______________________________________________________

(2)

4.3

Which TWO external forces are expected to act in your proposed solution?

________________________________________________________(2)

4.4 Choose TWO materials that could be used in solving the problem. Give a

property of each material that you chose .

___________________________________________________________

___________________________________________________________(4)

4.5 In improving the safety of your solution, what additional features would

you consider adding? Name any TWO.

__________________________________________________________ (2)

4.6 Use sketches to show how the following forces act:

i. Compression

ii. Shearing

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iii. Tension

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iv. Torsion

(8)

[20]

QUESTION 5 (SYTEMS AND CONTROL) Gear A and B are shown in the figure below. Gear A is driven.

5.1 Use the formula given above to calculate the gear ratio in the above gear train

(4) 5.2 Is the system increasing or decreasing the speed? Give a reason for your

Answer ________________________________________________________ (2)

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5.3 Draw the system diagram of the gear train above.

(6)

5.4 If gear A rotates one revolution, how many revolutions will gear B rotate?

______________________________________________________ (2)

5.5 If the driver gear rotates clockwise how would the driven gear rotate?

_______________________________________________________ (1)

5.6 Explain how you would make gear A and gear B to rotate in the same

direction.

________________________________________________________ (2)

5.7 Give THREE examples of common machines that use gears

(3)

____________________________

_____________________________

______________________________

[20]

TOTAL SECTION B: [40]

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SECTION C QUESTION 6

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A

A ramp and stair is shown above in Isometric projection. Use the Answer sheet provided to draw a First Angle Orthographic Projection.

1. Draw the Front View as indicated by Arrow A

2. The LEFT SIDE VIEW showing hidden detail

3. Top view

(15)

NB. Dimensions on the drawing may not be USED. i.e. You MAY use your OWN measurements

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